By Daniel Kline Yes, the warehouse club often has the lowest gas prices–but they could actually be lower. Costco (COST) – Get Costco Wholesale Corporation Report offers a very simple proposition to its members. You pay $60 for basic access or $120 for premium access (which comes with 2% cash back on most purchases up to $1,000 per year) in order to get access to the chain’s warehouse “clubs.” In exchange for that membership fee, members get very low prices. Basically, Costco offers no frills — its stores aren’t just called warehouses, they actually are warehouses — and items are basically j…